Rule 34 Dev - 2007 abs anthro balls_outline biceps black_and_white bodily_fluids bottomwear boxer_briefs bulge canid canine canis clothed clothing cover dobermann domestic_dog exercise magazine_cover male male_only mammal monochrome muscular muscular_male nudog pecs penis_outline pinscher punching_bag sketch solo sweat topless underwear workout|3856689552